Thermostat or control board maybe. Mine was doing something similar and I replaced the thermostat. Depending on where you get it I think the thermostat is about 25-30 (Dometic).
As far as removing the furnace I've heard of some that were a real bear to get to but mine have always been pretty easy. Some were accessed outside and some from the inside. This one has a super easy louvered wood door with 4 screws; pull it and converter and furnace are all in the big cavity in there.
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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